Speci cation of Stochastic Properties in Real-Time Systems

In this paper we present a new approach to the formal speciication of distributed real-time systems using the formal description technique LOTOS together with a stochastic temporal logic STL. This approach previously presented in the context of LOTOS/QTL, is characterized by a separation of concerns. The functional behaviour is described in LOTOS without regard for the time critical constraints. The speciication is then extended with precise real-time requirements written in STL. We present a method to generate a timing event scheduler from the requirements in order to monitor the functional behaviour.